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7. The chart shows the waiting times for customers while having winter tires installed on their cars. Time (min) Frequency 30-35 10 35-40 16 40-45 21 45-50 17 50-55 19 55-60 8. 60-65 2. When calculating the standard deviation for data in intervals, use the following formulas: t • m)- N N. and where f is the respective frequency of each interval and m is the mterval midpoint. a) Using the midpoints of the intervals as the measurements, estimate the mean and standard deviation of the wait times. b) Did you use the population or sample formulas? Why? c) Calculate the z-scores of each of the midpoints. d) Draw a histogram and mark the information from part c) on the graph.

7. The chart shows the waiting times for customers while having winter tires installed on their cars. Time (min) Frequency 30-35 10 35-40 16 40-45 21 45-50 17 50-55 19 55-60 8. 60-65 2. When calculating the standard deviation for data in intervals, use the following formulas: t • m)- N N. and where f is the respective frequency of each interval and m is the mterval midpoint. a) Using the midpoints of the intervals as the measurements, estimate the mean and standard deviation of the wait times. b) Did you use the population or sample formulas? Why? c) Calculate the z-scores of each of the midpoints. d) Draw a histogram and mark the information from part c) on the graph.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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7. The chart shows the waiting times for customers while having winter tires installed on their cars. Time (min) Frequency 30-35 10 35-40 16 40-45 21 45-50 17 50-55 19 55-60 8. 60-65 2. When calculating the standard deviation for data in intervals, use the following formulas: t • m)- N N. and where f is the respective frequency of each interval and m is the mterval midpoint. a) Using the midpoints of the intervals as the measurements, estimate the mean and standard deviation of the wait times. b) Did you use the population or sample formulas? Why? c) Calculate the z-scores of each of the midpoints. d) Draw a histogram and mark the information from part c) on the graph.
Transcribed Image Text:7. The chart shows the waiting times for customers while having winter tires installed on their cars. Time (min) Frequency 30-35 10 35-40 16 40-45 21 45-50 17 50-55 19 55-60 8. 60-65 2. When calculating the standard deviation for data in intervals, use the following formulas: t • m)- N N. and where f is the respective frequency of each interval and m is the mterval midpoint. a) Using the midpoints of the intervals as the measurements, estimate the mean and standard deviation of the wait times. b) Did you use the population or sample formulas? Why? c) Calculate the z-scores of each of the midpoints. d) Draw a histogram and mark the information from part c) on the graph.
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